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<h1>HTML Help API Reference
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<p>The HTML Help API Reference provides information on the HTML Help application programming interface (API), which enables a program to display a help window. It includes comprehensive information about how to use the HTML Help API commands, data structures, and notification messages.</p>


<p>The reference provides the following sections:</p>
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<li><p>The <a href="ms-its:api.chm::/ov_html_help_api_overview.htm">overview</a> section describes the HTML Help API, and explains the syntax required to access it.</p>



<li><p>The <a href="ms-its:api.chm::/ov_ref.htm">reference</a> topics provide syntax descriptions and code examples for all commands that can be passed to HtmlHelp(), and syntax descriptions for all structures and notification messages used by HtmlHelp().</p>
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